The closest I ever got to a transparent image was actually a watermark.
Check out the eso-pic package (
http://www.ctan.org/tex-archive/macros/latex/contrib/eso-pic/)
Cheers,
Bob
On Thu, Mar 5, 2009 at 1:45 PM, Philip TAYLOR <P.Taylor at rhul.ac.uk> wrote:
> Dear Colleagues -- I am including a large number (> 4000)
> of graphic images in PDF format in a LaTeX document through
> the medium of the Graphicx interface. To achieve a nice
> visual balance between the images (which were scanned at
> different times, and processed using different technologies),
> I can adjust the relative size of each. But for some extremely
> heavy images (see attached, which are the same abbreviation
> in two very different scribal hands, and processed using
> very different technologies), reducing the size is insufficient :
> what I really need is to be able to make the heavier graphic less
> intrusive, either by rendering it partially transparent or
> by mapping the fully saturated black to a less saturated grey.
>> I can find nothing in the Graphicx documentation that suggests
> that either of these is possible, but in the faint hope that
> I have overlooked something, I am asking here.
>> Philip TAYLOR
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